Black Hole found in the Milky Way

The supermassive black hole at the center of the Milky Way galaxy is known as Sagittarius A*. Astronomers have several thoughts and concerns about the discovery, including how the Milky Way was actually formed and how supermassive black holes affect the formation of galaxies. Sagittarius A* is compared to TON 618, the ultramassive black hole, and the black hole at the heart of M87